The new version 3 of the REBOL programming language supports extensions written in other languages. Extensions are implemented on top of the modules framework, which is also new. Extensions can be separate dynamically loaded libraries, or they can be embedded in the REBOL executable. In fact, REBOL 3 is now highly modularised: a number of its subsystems are embedded modules, and subsystems written in C and C++ are embedded extensions. Those modules and extensions are part of the open host kit, so that custom collections can be compiled into REBOL executables.

no return... If I'm writing code in another language it may be time for me to simply move to that language completely and say good bye to the legacy. This forces more than just 'experimentation' and a bunch of requirements to grow for a future programmer to take the position I'm in or job I hold. Just say no to REBOL and use what works better, just about anything.